CN2425625Y

CN2425625Y - Bone external fixator

Info

Publication number: CN2425625Y
Application number: CN 00229161
Authority: CN
Inventors: 李绍刚; 蒋冠珞; 邢承华; 肖自强; 吴银波
Original assignee: Individual
Current assignee: Individual
Priority date: 2000-01-28
Filing date: 2000-01-28
Publication date: 2001-04-04
Anticipated expiration: 2010-01-28

Abstract

The utility model provides a bone external fixer, which is mainly composed of a rack body, wherein, both ends of the rack body are connected with two needle clamping blocks through two universal joints. A universal joint locking device is arranged in the rack body. For shortening the length of the rack body, the two universal joints share one locking shaft in double-direction. The locking shaft in double-direction is arranged in a shaft hole at the center of the rack body. The locking shaft in double-direction is closely adjacent to two tightly pressing blocks for locking the two universal joints. When the universal joints are locked, the two tightly pressing blocks are simultaneously pressed by the locking shaft and the two universal joints are locked. A length adjusting device is arranged between the needle clamping block and the universal joint. The utility model has the advantages of reduction of the minimum distance of two groups of needles and enhancement of stability and reliability.

Description

The orthopaedics external fixator

This utility model relates to a kind of orthopaedics external fixator, belongs to the medical surgical apparatus.

The external fixation of the usefulness that resets after the fracture has experienced plaster splint external fixation method, open reduction adds inner fixed law, has developed into the fixation that external and internal fixation combines now, because of it has advantage extensive uses such as easy, that damage is little, stable.Now be its formation of example explanation with the unilateral external fixator: the external fixator stage casing is a support body, its two ends are connected with two folder pin pieces at two ends by two universal joints, each universal joint all has a retaining mechanism to be contained in the intermediary support body, and length regulator is also on support body.During use, will fracture earlier resets as far as possible, and the spicule that will press from both sides again on the pin piece creeps into the fracture site both sides, clamps with folder pin piece.By adjusting length adjuster fracture is resetted then, the locking universal joint has promptly fixed.This external fixator is easy to use, and the patient can be free movable, helps rehabilitation.But in use finding has following shortcoming: because of two retaining mechanisms and length adjuster are housed in the retainer body, thereby retainer body is long, this just makes the beeline between two groups of locking pins be restricted, must be at distance fracture position nail pin far away.From the angle of mechanics analysis, the big more twisting resistance of this distance is big more, influences fixed degree of stability, and ideal situation is that first pair of nearest in two groups of pins pin should be positioned as close to fracture, and a correspondence farthest is as far as possible away from fracture.After fixing like this, its mechanical structure stability, reliability are best.Existing holder can't reach this requirement because of main body is oversize.

The purpose of this utility model is a kind of external fixator that shortens support body length as far as possible, shortens two groups of pin closest approach distances of design, improves the stability and the reliability of holder.

The technical solution of the utility model is achieved in that

This orthopaedics external fixator, mainly comprise support body 1, its two ends press from both sides pin pieces 4 and are connected with 5 with two with 3 by two universal joints 2, universal joint retaining mechanism 7 is arranged in the support body, two folder pin interblocks have length adjuster 6, it is characterized in that two shared bidirectional locking mechanisms 7 of universal joint, i.e. reversible lock mandrel 7-1, place the locking axis hole 7-2 at support body center, it all is close to two the compact heap 2-2 and the 3-2 of locking

universal joint

2 and 3, and actuator 6 is located between the folder pin piece and universal joint of a side.

Above-mentioned orthopaedics external fixator is characterized in that the main body of reversible lock mandrel 7-1 is taper shape or wedge shape, and the application of force hole 7-3 that regulates its position in locking axis hole 7-2 is arranged on it.

Above-mentioned orthopaedics external fixator is characterized in that reversible lock mandrel 7-1 adopts expansion bolt formula structure, and it mainly comprises expansion axis body 7-1 and screw 7-3.

Above-mentioned orthopaedics external fixator is characterized in that reversible lock mandrel main body is bidirectionally eccentric axle 7-1, and application of force hole 7-3 is arranged on it.

The utility model has the advantages that: the nearest needle gage in fracture point both sides is reduced to 7cm from 11cm, and one group of pin spacing of the side of fracturing increases to 7.8cm by 2.5cm.Fixed stability and reliability have greatly been improved.

Below accompanying drawing is described: Fig. 1 is a structural representation of the present utility model, Fig. 2 is reversible lock mandrel and locking device partial cutaway diagrammatic sketch, also is that lock shaft is that embodiment sketch map, Fig. 3 of cone is that lock shaft is the embodiment cut-away view that adjusting rod is arranged on the wedge slider.Fig. 4 be structure cut-away view, the Fig. 5 during with expansion bolt formula structure be the reversible lock mandrel when being bidirectionally eccentric axle embodiment sketch map, Fig. 6 be the A-A sectional view of Fig. 5.1 is that support body, 2 and 3 is that both sides universal joint, 4 and 5 is folder pin pieces, the 6th among the figure, and length adjuster, the 7th, bidirectional locking mechanism, 2-2 and 3-2 are that compact heap, 7-1 are that lock shaft, 7-2 are that locking axis hole, 7-3 are the application of force holes (or bar) on the lock shaft.

The following describes embodiment of the present utility model: embodiment basic structure of the present utility model is provided by accompanying drawing, and the force mechanism of every kind of form locking has multiple, and available hexagonal square hole and die nut are used, also the turning handle form of available other easy application of force.The embodiment that Fig. 3 provides has adjusting rod 7-3 on the wedge slider, and when the 7-3 rotation moved down, its pullover pressure floating block that is set in the floating block moved down, and reaches the purpose of locking.In each folder pin piece the spicule groove establish a plurality of, the spacing of optional one group of pin in the time of can using fully, other technical application requires same as the prior art.

Claims

1, a kind of orthopaedics external fixator, mainly comprise support body (1), its two ends are connected with (5) with two folder pin pieces (4) with (3) by two universal joints (2), universal joint retaining mechanism (7) is arranged in the support body, two folder pin interblocks have length adjuster (6), it is characterized in that two shared bidirectional locking mechanisms of universal joint (7), an i.e. reversible lock mandrel (7-1), place the locking axis hole (7-2) at support body center, it all is close to two compact heaps (2-2) of locking universal joint (2) and (3) with (3-2), and actuator (6) is located between the folder pin piece and universal joint of a side.

2, orthopaedics external fixator according to claim 1 is characterized in that the main body of reversible lock mandrel (7-1) is taper shape or wedge shape, and the application of force hole (7-3) of regulating its position in locking hole (7-2) is arranged on it.

3, orthopaedics external fixator according to claim 1 is characterized in that reversible lock mandrel (7-1) adopts expansion bolt formula structure, and it mainly comprises expansion axis body (7-1) and screw (7-3).

4, orthopaedics external fixator according to claim 1 is characterized in that reversible lock mandrel main body is bidirectionally eccentric axle (7-1), has afterburning hole (7-3) on it.